Sheet-metal cutter.



C. J. HOLUB.

SHEET METAL CUTTER.

APPLICATION FILED JULY 10, 1913.

Patented Dec. .29, 1914.

2 SHEETS"$HEET 1.

THE NORRIS PETERS c0. FHOTO-LITHO. WASHNI; my. D c

Patented Dec. 29, 1914.

2 SHEETS-SHEET 2.

UNITED STATES PATENT @FFTCE.

CHARLES J'. HOLUB, F NEWPORT, KENTUCKY, ASSIGNOB TO THE BECK-WILLIAMSON HEATING &, VENTILATING- COMPANY, OF CINCINNATI, OHIO, A CORPORATION OF OHIO.

SHEET-METAL CUTTER.

Application filed July 10, 1913.

To all whom it may concern:

Be it known that I, CHARLES J. HOLUB, a citizen of the United States, and residing at Newport, in the county of Campbell and State of Kentucky, have invented a new and Improved Sheet-Metal Cutter, of which the following specification is a full disclosure.

My invention relates to a device for the circular cutting of sheet metal blanks.

The object of the invention is to provide a simple and efiicient device for cutting selective curves, the resultant blanks to be rolled up into approximately conical forms, constituting sheet metal structures of standard requisition in furnace and pipe manufacture.

Another object of the invention is the provision of convenient, effective and accurate means for selectively varying the dimensions of the blanks.

Another object relates to the provision of means selectively determining the radii of the cuts.

By these provisions the longitudinal area is predetermined, as well as the arcs of the boundary curve edges, enabling the production of anv desired blank involving the structural principle.

The features of the invention are more fully set forth in connection with the description of the accompanying drawings, forming a part of this specification, in which Figure 1 is aside elevation of the machine. Fig. 2 is a sectional view on line 2-2, Fig. 1. Fig. 3 is a top plan view showing the blank in position for the first cut. Fig. 4 is a front elevation of the clamping jaws, partlv in section to show the guide 1118. p The primary support is an I-beam 1, horizontally lreld in any desired manner, the front end having the cut-away portion 2, for supporting the cutter mechanism 3, see Figs. 1 and 2. The cutter 1s of standard type having the jaws 4, shafts 5, connected by gears 6, 7, operated by crank 8, the cutter disks 9, 10, being fixed to the ends of shafts 5, the upper shaft having some play in its bearings, so that the cutting edges can be adjusted by screw 11, the table 12 being alined with the cutting edges to support the cut end of the sheet metal lying between the jaws 4, the plane of the cutter disks bemg transverse to the I-beam. On the upper Specification of Letters Patent.

Patented Dec. 29, 1914. Serial No. 778,270.

rail of the I-beam is a saddle 13, adjustably supported by blocks 14 and bolts 15. A rotatable, adjustable radius bar support 16 s placed on the upper face of saddle 13, held in place by plate 17 and bolts 18, so as to freely swlvel. It is formed with a transverse orifice through which passes the radius bar 20, being adjustably secured by clamp bolts 21. Preferably a bracket 22 is upwardly eX- tended from the saddle, a rail 23 being mounted on the free end to support the weight of the radius bar in its arc of swing for the cutting operation. The saddle is positioned by stops 24,25, adjustable on the I-beam, one margin of which bears the scale 26, with relation to which said stops are slidable. As shown in Figs. 1-3, the saddle engages stop 24, positioning the sheet metal blank with reference to the cutters for making the outer or longer arc incision, indicated by dotted lines aa, Fig. 3. To cut the inner or shorter curve, the saddle will be moved outwardly to contact the stop 25, positioning the parts for cutting the inner or shorter are indicated by dotted lines b-b. By adjusting the stops with reference to the scale, the dimensions of the blank between the curve boundaries may be predetermined. The radius bar bears the scale 19, and by adjusting said bar on the swivel support 16, with relation to said scale, the dimensions of the radius can be predetermined to position the work for the inner or outer cutsi. e. the longer or shorter arcs.

A short metal clamp is fixed to the outer end of the radius bar, comprising jaws 27, 28, guided by pins 29, the upper jaw 27 being hinged and passing between ears 30, projecting upwardly from the lower jaw. An eccentric or cam shaft 31, is journaled in the ears 30 and operated by handle 32, to clamp the jaws upon the margin of the sheet metal to be cut. The sheet 40 is cut with two angle edges 33, (say 30 angle) and with the parallel, straight edges 34, the blank is then centered and clamped on the end of the radius bar. The stops are adjusted togive the proper longitudinal dimensions, and the radius bar is adjusted to define the arcs to be out. A spring 35 normally spreads the jaws apart. With one hand the operator rotates the cutter disks and with the other he swings the radius bar on its center to carry the blank between the cutters. The rotation of the cutters is in the direction of the movement of the radius bar, and, therefore, has a feed influence to draw the blank to the cutting action. The saddle is then moved to engage the other stop, and the second cut is made.

The simplicity, convenience of adjustment and operation, and the accuracy of cutting are obvious.

Various changes can be made in the structure and arrangement without departing from the principle of .the invention.

Having described my invention, 1 claim:

A device for cutting sheet metal into blanks of diztierent dimensions and of pre determined radii, comprising in combination, a -marginally graduated supporting beam, a pair of cutting disks at one end thereof, stops adjustably clamping on the witnesses. V

CHARLES J HOLUB. WVitnesses @mvnn iB. KAISER, Louisn A. BECK.

09p!" rot this patent may be obtained for five cents each, by addressing the flommissioner to! Entrants Washington, D. 11; 

